Calendar apps are great, but sometimes you need to track how many days until a future event or project. In some cases, you might want to track days from the past. D-Day is a free, simple iOS program that manages both scenarios on iOS devices.

Mini Motor Racing and Mini Motor Racing HD are excellent top-down racing games from The Binary Mill. A good racing game requires three main features to come together: vehicle control, a variety of challenging courses and a heart-thumping soundtrack. Plus, it offers great multiplayer gameplay.

Former iPhone marketing manager Bob Borchers tells students how Steve Jobs originally approached the iPhone team with the challenge of building the iPhone, a device that to date has sold 183 million units in less than five years.

Matthew Waldman’s Nooka watches are far from your standard time-keeping devices, with various dial designs that often use digital, visual markers to indicate the passing of hours, minutes and seconds. With a new app launched Thursday, Nooka brings that time-telling magic to the iPhone.

Apple’s iPad still the tablet market leader in terms of sales, despite gains by the Kindle Fire, and a recent survey of tablet user satisfaction suggests it’s well-poised to stay ahead. Setting the standards for tablet-buyer expectations will help Apple continue to lead the pack.

On Friday, Motorola was granted a permanent injunction by a German court against a feature of Apple’s iCloud. The same day Apple removed some older models of iPhones and iPads from its German online store due to enforcement of another patent held by Motorola.

Want to watch the XLVI Super Bowl online or on your iPhone or Android handset? Or maybe you want to just check out the ads without watching the entire game? Either way, our list of 2012 Super Bowl links and resources has you covered.

WillCall is now available for download, with a few acts already lined up. The coolest part of WillCall — besides enabling poor planners and procrastinators of the world — is its attempt to capture the inherently social nature of concert-going within the app.

The Wallee is an iPad accessory that’s almost as old as the iPad. The new headrest mount that works with existing Wallee cases is a good example of smart accessory design that can grow with the iPad, rather than be left behind by Apple’s regular redesigns.

App developer Readdle has been busy lately. A big update arrived recently for its PDF Expert software for iPad, and now the company is also launching a new note-taking and PDF annotation app called Remarks. Here’s a hands on look at what the app offers users.